Mold-board or breaking plow



(No Model.)

M; s. & E. L. O'ADWELL.

MOLD BOARD 0R BREAKING PLOW.

N0. 39?;415. Patented Feb. 5, 1889.

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llnirien ra'rns MARVIN S. (IATHVELL AND EDWARD l1. CATHY ELL, OF LANSING, MICHIGAN.

MOLD-BOARD OR BREAKING PLOW.

SPECIFICATION forming part of Letters Patent No. 397,415, dated February 5, 1889. Application filed lanuary 23, 1888. gerial No. 261,575. (No model.)

To to whom it may concern: Inthe accompanying drawings, which form Be it known that we, lllARVlN S. UADWELL a part of this specification, and in which simiand EDWARD L. (EuWvnLL, citizens of the lar letters of reference indicate like parts,

United States, residing in Lansing, in the Figure l is a perspective view of a plow em- 5 county of Ingham and State of Michigan, bodying our invention. Fig. 2 is a bottom have invented a new and useful Improveview of the same. Fig. 3 is a longitudinal ments in Mold-Board or Breaking ,Plows, of section 011 line 3 3 of Fig. 1. Figs. 4, 5, and 6 which the .followingis a specification. are cross-sections on lines 4 at, 5 5, and 6 6, re-

Our invention relates to mold-board or spectively, ot Fig.1. Fig. 7 is a section 011 10 breaking plows, and especially to the point line 7 7 of Fig. 2. Fig. 8 is a detail crossand share or cutting-edge thereof. section. of the supplemental plate-steel share,

The object of our invention is to provide a and Fig. 9 is a detail viewof the supple- Inold-board plow with a strong, durable, and mental plate-steel point.

efficient cutting-edge and point of a simple In said drawings, A represents a mold- 15 and cheap construction. board plow; B, the cast share and point ad- The easy and proper operation of a moldjoining the mold-board, and to which the supboard or breaking plow, both to the plowman plemental thin plate steel cutting-share O holding the same and to the draft-animals and supplemental thin plate-steel cutting or pulling it, is largely dependent upon the working point D are attached.

2o proper sharpness of the cutting-edge of the The cast piece B of the plow is provided share and point, and also upon the length, with a longitudinal ledge or shoulder, 17, on its shape, and proportion of the pointiu relation upper face, extending back preferably'about to the other parts of the plow. XV hen plowone-half or two-thirds the length of the suping in hard or dry soil the ordinary cast-iron plemental point D, to form a bed for securing 25 point and share with which plows are comand holding the supplemental point in place monly furnished will frequently become so on the plow. For this same purpose also the dulled by less than a single days use as to part B is provided with a pin or lug, b, prefrequire their replacement by new ones. This erably cast integral with the part B and entails a heavy expense upon the farmer, and adapted to enter one of the holes cl in the sup 30 where tempered-steel points and shares are plemental point D. A bolt, (7, havingacounemployed, little practical advantage is gained tersunk head, (1 and nut d passing through because of the loss of time and expense ina hole, Z2 in the part B, secures the supplecident to resharpening them at the forge. mental point in place. The supplemental Our invention consists in a plow furnished point D consists of a thin narrow piece of 3 5 with a self-sharpening point and share made plate-steel, preferably about an inch and a of thin plate-steel, thin enough so that the half. or an inch and three-quarters wide and wear upon its edge does not appreciably dull about onequarter of an inch thick and from it, and so that the edge when slightly dulled five to eight inches in length, according to may be readily sharpened by a tile or by the plow to which it is to be secured. It is 4 grinding without ever requiring reforging. preferably made of old flat steel leaf-springs The plate-steel share and point are both made By making the point thus of thin plate or leafreversible, so that either end or edge may be spring steel it will not tend to wear blunt, used as the cutting-edge. The share and point and it may also be readily sharpenedb grindare also both secured adjustably upon the ing or filing, and will require no reforging.

45 plow, so that as they become worn away they The pointD is provided with aseries ofholes,cl, may be adjusted farther down and the proper through which the bolt (1' passes, and into one relation of length of point and share always of which the lug Z) projects. The cast point or preserved to the plow. share part B of the plowhasarecess or cavity,

Our invention also consists in the novel 6 in its under face, to receive the nut (Z 5 devices and novel combinations of devices Both ends of the supplemental point may be herein shown and described, and more parused as the cutting end or edge, and thepoint ticularly pointed out in the claims. is thus reversible, the series of holes (Z being iocated at the middle portion of the point. As the upper surface of the cast plow point and share 13 is of course a'curved and not a plane surface, the supplemental plate-steel point D is correspondingly curved, so that it will lie flat upon the upper surface of the vast plow point and share B. This twistor curve in the supplemental point D does not interfere with the reversibility of the same,

as both ends of .the same are symmetrical and fit equally well the curved surface of. the east plow point and share 1- By referring to Fig. 9 and also to the cross-sections, Figs. 3, 5, and ('5, it will be seen that the two cutting edges or ends (1" (1 of the supplemental point I) do not lie in the same plane,owingto the slightly twisted or curved shape of the point.

The plate-steel share (1 is preferably made of plate-steel about one-eighth of an inch in thickness, so that it will be sel f-sl'iarpenin g as it wears away. It should be from two to three inches in width, so that it may have a firm flat bearing on the'under surface of the eastshare part B, and its cutting-edge projects from one-half inch to one inch, or such matter, in front of the edge of the cast-share part B. The supplemental self-sharpening steel share 0 is secured. rigidly and firmly to the cast-share part 13 of the plow by rivets c, inserted through suitable holes in the parts ll and C.

To provide for the adjustment of the supplcmental plate-steel share (I farther down as it wears away, we usually provide it with a series of rivet-holes, c two or moreclose together. Both edges 0 of the supplemental.

,. plate-steel share are adapted for use as the cutting-edge, the steel-share being reversible by simply turning it over, the same ends of the share-plate being kept adjacent to the point D. The cutting-edges c of the shareplate 0, it will be observed from Fig. 8, are sharpened or beveled from opposite sides of the plate, so that when the plate is reversed each. cutting-edge will have a Hat plane under surface. One or both of the cutting-edges c of the supplemental share C are preferably serrated, or provided with a series of teeth, 0 having inclined sharpened front edges, 0', as we find by experiment that such notched or serrated edge materially diminishes the draft of the plow. In the drawings we have shown the share C provided with one smooth or straight cutting-edge and one serrated. Obviously, however, we prefer to make both outtin g-edgcs serrated.

To adjust the share-plate (i [farther down, or to reverse it, the rivets c are punched out and new ones inserted. The share-plate is secured by rivet-s, in order that both its upper and under surfaces may be smooth. The supplemental plate-steel. share O is secured in a horizontal positionv to the plow, and it thus occupies the best position or relation for cutting with ease.

\Ve do not heroin claim, ln'oadly, the thin supplemental self-sharpening point in combination with the cast point, share, and. landside of the mold-board plow, as that forms the subjwt-matter of our previous application, Serial No. M8500, filed September .l, 1887. Nor do we herein claim any subjectanatter which is shown, described, and claimed in. said former application, to which application and the patent to be issued thereon reference is hereby made for greater certainty.

1. The share D, having a supplemental thin self-sharpening point, D, adjustably secured on the upper face of said part 13, and a thin sel..l-sharpening supplemental share, C, secured on the under face of said part 13, substantially as specified.

The coinlnnation, with a mold-board plow, of a cast share, 13, having a thin supplemental self-sharpening share, C, and a thin supplemental self-sharpening point, I), both secured to said sharel substantially as specified.

The combination, with a mold-board plow and its part B, of a slightly twisted or curved thin p'latesteel reversible and adjust.- able supp emental point, D, secured on the top face ol? said part B, said point D having two cutting-edgts lying in different planes, substantially as speci lied.

MARVIN S. CAD\VELL. EDWARD L. UADXVELL.

Witnesses:

E. O. KELLEY, JOHN B. 0001;. 

